package com.xm.interceptor;


import com.xm.context.BaseContext;
import com.xm.exception.BaseException;
import com.xm.properties.JwtProperties;
import com.xm.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenEmployeeInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
//        String token = request.getHeader(jwtProperties.getEmployeeTokenName());
        String token = request.getHeader("token");
        if (token ==null | token ==""){
            throw new BaseException("当前未登录");
        }
        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            // 拿到jwt封装的参数放到线程1对象
            Claims claims = JwtUtil.parseJWT(jwtProperties.getEmployeeSecretKey(), token);
            Long empId = Long.valueOf(claims.get("emp_id").toString());
            log.info("当前员工id：{}", empId);
//            将当前线程的用户信息放到Thread
            BaseContext.setCurrentId(empId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        BaseContext.removeCurrentId();
    }
}
